Flue-cutter.



Patented May 2|. l90l.

C. 8. DE BOLT &. T. W. HINDE.

FLUE CUTTER.

(Application filed Jan. 12, 1901.)

(No Model.)

m u I UNITED STATES PATENT CORNELIUS B. DE BOLT AND THOMAS XV. HINDE, OF CHEROKEE, IOWA.

FLU E-CUTTER.

SPECIFICATION forming oart of Letters Patent No. 674,553, dated May 21, 1901.

Application filed January 12, 1901. Serial No. 43,066. (No model.)

Be it known that we, CORNELIUS B. DE

BOLT and THOMAS W. HINDE, citizens of the United States, and residents of Cherokee, Iowa,'have invented certain new and useful Improvements in Flue-Cutters, of which the following is a full, clear, and exact specification.

Our invention relates to fluecutters in which a cutter reciprocates axially of a casing, the latter rotating after the cutter has reached the limit of its outward movement, both cutter and casing being operated by a rotary spindle.

The invention relates particularly to the means for connecting the spindle and easing.

To this end the invention includes means for operating the cutter to move the same into cutting position in advance of the rotation of the same in the casing and for returning the parts to their initial position after each operation.

The invention is shown in the accompanying drawings, in which- Figure 1 is a side elevation with sleeve removed. Fig. 2 is a side elevation showing the spindle turned to raise the cutting-knife. Fig. 3 is a horizontal longitudinal sectional view. Fig. 4 is a vertical sectional view taken on the line a: x of Fig. 1, showing in dotted lines the spindle turned to raise the knife; and Fig. 5 is a View of the cutting-block.

The cylindrical casing or shell alias an axial bore which terminates within the end thereof, I

from which a radial slot 1), extending through the casing, leads to provide a guide for a cutter-block 0, having an opening to receive-an eccentric projection, extending from the end of the spindle. The cutter e is fitted to a dovetailed slot in said block to permit of its ready removal when worn and the insertion of a new blade. The rear end of the spindle is provided with an integral head g,having radial holes for the reception of a lever for turning the spindle, and from the head a pro ection It extends, which forms a locking radial projection on the spindle, which is adapted to interlock with a like projection 2', extending from the end of said casing. A spiral spring'm, surrounding thespindle and inclosed within the casing, has one of its ends secured in a hole in the former and its opposite end retained in a slot in the latter. This spring normally holds the casing and spindle in such relative relations that the knife is withdrawn within the periphery of the casing. With the parts in this position the tool is inserted within the flue to be cut. The initial rotation of the spindle takes place independently of the easing, expanding spring on until the parts reach the position shown in Fig. 2,-when the projections coming in contact the spindle and casing rotate in unison. During the independent rotation of the spindle the cutter is forced out, piercing the fine. The continued rotation of the spindle carries the cutter around, which cuts out a section. The spindle is freed after a complete rotation of the cutter, and the spring on automatically returns the parts to normal position to permit the tool to be again positioned Within the flue.-

A sleeve 00 is secured to the casing to cover the working parts and provide a surface to be gripped by the hand of the operator. The sleeve is held in position by means of a screw ac, projecting into a circumferential groove in the casing,which permits of the-rotation of the latter independently of the sleeve.

To hold the spindle in place within the casing, which will lock the cutter-block in place having a transverse slot eiztending through the same near the end thereof and an axial bore extending from the opposite end of the casing and terminating in said transverse slot, an integral projection on the end of the easing, a knife and knife-carrier guided in said slot, a spindle fitted to said bore, an eccentricpin carried thereby engaging the knife-carrier, an integral head on said spindle, and an integral projection extending from the end of the head coacting with the projection on the casing, substantially as described.

2. In combination, a casing having a transverse slot and central bore, a projection from the end of the casing, a spindle fitted to said bore, a knife and knife-carrier, an internal annular pocket in the end of the casing about said spindle, a spring located therein, an integral head on the spindle of the same diameter as said casing, a projection extending projection on said casing, a circumferential slot in said casing, a pin extending from the spindle into said slot and asleeve carried by the casing covering said slot and the space between the casing and spindlehead, substantially as described.

In witness whereof we have hereunto set our hands in presence of two witnesses.

CORNELIUS B. DE BOLT. THOMAS W. HINDE.

Witnesses:

L. A. WIWEKE, CLAUD M. SMITH. 

